Mechanism of the Chert Formation within the Lacustrine Carbonates of the Lower Cretaceous Yixian Formation, Western Liaoning Province

• 责任者：Chen Denghui (Geology Department ; Northeastern University ; Shenyang 110004 ; China) ; Gong Enpu
• 刊名：Acta Geologica Sinica
• 出版年：2010
• 卷期：84(8)
• 关键词：碳酸盐岩 ; carbonate rocks ; 燧石岩 ; chert ; 辽宁 ; Liaoning Province
• 页码：p.1208-1214
• 图表：5 illus., 27 refs.
• 分类号：0803
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

Four types of lacustrine facies carbonate developed within the Zhuanchengzi section of the Lower Cretaceous Yixian Formation have been recognized in Yixian County of western Liaoning Province. Among them, plenty of chert occurs in brecciated nodular limestone-facies carbonate. The chert can be divided into three types: nodular, lenticular and glaebule based on its configuration, while two types of chert can be defined based on color and transparency. The chert consists mainly of microcrystalline quartz and chalcedony with small amount of calcite and dolomite crystals. The study suggests that the sedimentary environment of carbonates might be relatively-dry, shallow short-lived isolated sags on the floodplain partially accompanied with volcanic activity.